Momentum can change trends in international relations. A series of summits in Panmunjom and Tokyo has created growing momentum toward dialogue and peace rather than pressure and tension.

In April, the leaders of the two Koreas agreed to work with the United States and China with a view to ending the seven-decade Korean War and pursuing the "complete denuclearization" of the Korean Peninsula.

This month, the leaders of Japan, China and South Korea displayed cooperative and amicable postures. The rising momentum toward improvement in Japan-China ties and Japan-South Korea relations has dramatically changed a regional vibe long strained by sensitive issues such as "comfort women" and the Senkaku Islands.